Implantable pacemaker and method of detecting a pacemaker mediated tachycardia

摘要

A pacemaker mediated tachycardia detection system and method provides pacemaker mediated tachycardia detection at maximum tracking rates in implantable pacemakers having a Wenckebach upper rate-response. The system senses atrial cardiac events and delivers ventricular pacing pulses to a ventricle of the heart during a number of cardiac cycles sufficient to evoke a Wenckebach response. Each ventricular pacing pulse is delivered following a sensed atrial event. The system determines if the cardiac rate is substantially constant during a number of cardiac cycles sufficient to evoke a Wenckebach response. A substantially constant cardiac rate during the number of cardiac cycles is indicative of a pacemaker mediated tachycardia at the maximum tracking rate. <IMAGE>